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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b5500e80ff59974c5839cc39da5e6570507c7430e7d2461ddba24b29d86404a' 
  AND token = 'yRn3HXDqWN1rUsiafi7o/MfsDWE7RGob6pFu8n5y4Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}